BSO4 Blind Threaded

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Blind Threaded Standoffs BSO4-U

Self Clinching Fasteners • Standoffs For Sheet Metal
American Standard (Inches) & Metric Sizes

UNICORP Electronic Hardware Self-Clinching Fasteners - Blind Threaded BSO, BSOS, BSOA, BSO4

• Self-clinching • Installed quickly and easily in metal panels that are 0.040" /1.00 mm thick
• Installed using pneumatic, hydraulic, or mechanical press • No secondary operation needed prior to installation
• With blind standoff, outer sheet surface is both flushed and closed

American Standard Sizes: • Series BSO4-U

Metric Sizes: • Series BSO4-U

Series BSO4-U

Series BSO4-U / American Standard Sizes

• Head Shape- Hex • Sheet Hardness- HRB 88 / HB 176 or Less • Material- 400 Series Stainless Steel • Finish- Passivated per ASTM A380
	Series BSO4-U American Standard Sizes (SAE)

Part
Number

Thread

"H"
Nom.

"L"
Body
Length

"F"
Full Thread
Min. Depth

Min.
Sheet
Thickness

Hole
Size in
Sheet

"C"
Barrel
O.D.

Min.
Distance
to Edge

Mil-Spec

BSO4-440-4-U

4-40

3/16"

0.125"

0.156"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-6-U

4-40

3/16"

0.187"

0.156"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-8-U

4-40

3/16"

0.250"

0.156"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-10-U

4-40

3/16"

0.312"

0.156"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-12-U

4-40

3/16"

0.375"

0.156"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-14-U

4-40

3/16"

0.437"

0.187"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-16-U

4-40

3/16"

0.500"

0.250"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-18-U

4-40

3/16"

0.562"

0.250"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-20-U

4-40

3/16"

0.625"

0.250"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-22-U

4-40

3/16"

0.687"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-24-U

4-40

3/16"

0.750"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-26-U

4-40

3/16"

0.812"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-28-U

4-40

3/16"

0.875"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-30-U

4-40

3/16"

0.937"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-32-U

4-40

3/16"

1.000"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-440-34-U

4-40

3/16"

1.062"

0.375"

0.040"

0.166"

0.165"

0.230"

N/A

BSO4-6440-4-U

4-40

1/4"

0.125"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-6-U

4-40

1/4"

0.187"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-8-U

4-40

1/4"

0.250"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-10-U

4-40

1/4"

0.312"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-12-U

4-40

1/4"

0.375"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-14-U

4-40

1/4"

0.437"

0.187"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-16-U

4-40

1/4"

0.500"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-18-U

4-40

1/4"

0.562"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-20-U

4-40

1/4"

0.625"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-22-U

4-40

1/4"

0.687"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-24-U

4-40

1/4"

0.750"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-26-U

4-40

1/4"

0.812"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-28-U

4-40

1/4"

0.875"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-30-U

4-40

1/4"

0.937"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-32-U

4-40

1/4"

1.000"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-6440-34-U

4-40

1/4"

1.062"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-4-U

6-32

1/4"

0.125"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-6-U

6-32

1/4"

0.187"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-8-U

6-32

1/4"

0.250"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-10-U

6-32

1/4"

0.312"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-12-U

6-32

1/4"

0.375"

0.156"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-14-U

6-32

1/4"

0.437"

0.187"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-16-U

6-32

1/4"

0.500"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-18-U

6-32

1/4"

0.562"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-20-U

6-32

1/4"

0.625"

0.250"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-22-U

6-32

1/4"

0.687"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-24-U

6-32

1/4"

0.750"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-26-U

6-32

1/4"

0.812"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-28-U

6-32

1/4"

0.875"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-30-U

6-32

1/4"

0.937"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-32-U

6-32

1/4"

1.000"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-632-34-U

6-32

1/4"

1.062"

0.375"

0.040"

0.213"

0.212"

0.270"

N/A

BSO4-8632-4-U

6-32

5/16"

0.125"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-6-U

6-32

5/16"

0.187"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-8-U

6-32

5/16"

0.250"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-10-U

6-32

5/16"

0.312"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-12-U

6-32

5/16"

0.375"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-14-U

6-32

5/16"

0.437"

0.187"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-16-U

6-32

5/16"

0.500"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-18-U

6-32

5/16"

0.562"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-20-U

6-32

5/16"

0.625"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-22-U

6-32

5/16"

0.687"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-24-U

6-32

5/16"

0.750"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-26-U

6-32

5/16"

0.812"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-28-U

6-32

5/16"

0.875"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-30-U

6-32

5/16"

0.937"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-32-U

6-32

5/16"

1.000"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-8632-34-U

6-32

5/16"

1.062"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-4-U

8-32

5/16"

0.125"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-6-U

8-32

5/16"

0.187"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-8-U

8-32

5/16"

0.250"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-10-U

8-32

5/16"

0.312"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-12-U

8-32

5/16"

0.375"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-14-U

8-32

5/16"

0.437"

0.187"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-16-U

8-32

5/16"

0.500"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-18-U

8-32

5/16"

0.562"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-20-U

8-32

5/16"

0.625"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-22-U

8-32

5/16"

0.687"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-24-U

8-32

5/16"

0.750"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-26-U

8-32

5/16"

0.812"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-28-U

8-32

5/16"

0.875"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-30-U

8-32

5/16"

0.937"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-32-U

8-32

5/16"

1.000"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-832-34-U

8-32

5/16"

1.062"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-4-U

10-32

5/16"

0.125"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-6-U

10-32

5/16"

0.187"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-8-U

10-32

5/16"

0.250"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-10-U

10-32

5/16"

0.312"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-12-U

10-32

5/16"

0.375"

0.156"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-14-U

10-32

5/16"

0.437"

0.187"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-16-U

10-32

5/16"

0.500"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-18-U

10-32

5/16"

0.562"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-20-U

10-32

5/16"

0.625"

0.250"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-22-U

10-32

5/16"

0.687"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-24-U

10-32

5/16"

0.750"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-26-U

10-32

5/16"

0.812"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-28-U

10-32

5/16"

0.875"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-30-U

10-32

5/16"

0.937"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-32-U

10-32

5/16"

1.000"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

BSO4-1032-34-U

10-32

5/16"

1.062"

0.375"

0.050"

0.281"

0.280"

0.310"

N/A

Series BSO4-U / Metric Sizes

• Head Shape- Hex • Sheet Hardness- HRB 88 / HB 176 or Less • Material- 400 Series Stainless Steel • Finish- Passivated per ASTM A380
	Series BSO4-U Metric Sizes

Part
Number

Thread

"H"
Nom.

"L"
Body
Length

"F"
Full Thread
Min. Depth

Min.
Sheet
Thickness

Hole
Size in
Sheet

"C"
Barrel
O.D.

Min.
Distance
to Edge

Mil-Spec

BSO4-M3-6-U

M3 x 0.5

4.80
mm

6.00
mm

3.20
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-8-U

M3 x 0.5

4.80
mm

8.00
mm

4.00
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-10-U

M3 x 0.5

4.80
mm

10.00
mm

4.00
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-12-U

M3 x 0.5

4.80
mm

12.00
mm

5.00
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-14-U

M3 x 0.5

4.80
mm

14.00
mm

6.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-16-U

M3 x 0.5

4.80
mm

16.00
mm

6.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-18-U

M3 x 0.5

4.80
mm

18.00
mm

9.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-20-U

M3 x 0.5

4.80
mm

20.00
mm

9.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-22-U

M3 x 0.5

4.80
mm

22.00
mm

9.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-M3-25-U

M3 x 0.5

4.80
mm

25.00
mm

9.50
mm

1.00
mm

4.22
mm

4.20
mm

6.00
mm

N/A

BSO4-3.5M3-6-U

M3 x 0.5

6.40
mm

6.00
mm

3.20
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-8-U

M3 x 0.5

6.40
mm

8.00
mm

4.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-10-U

M3 x 0.5

6.40
mm

10.00
mm

4.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-12-U

M3 x 0.5

6.40
mm

12.00
mm

5.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-14-U

M3 x 0.5

6.40
mm

14.00
mm

6.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-16-U

M3 x 0.5

6.40
mm

16.00
mm

6.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-18-U

M3 x 0.5

6.40
mm

18.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-20-U

M3 x 0.5

6.40
mm

20.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-22-U

M3 x 0.5

6.40
mm

22.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-3.5M3-25-U

M3 x 0.5

6.40
mm

25.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-6-U

M3.5 x 0.6

6.40
mm

6.00
mm

3.20
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-8-U

M3.5 x 0.6

6.40
mm

8.00
mm

4.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-10-U

M3.5 x 0.6

6.40
mm

10.00
mm

4.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-12-U

M3.5 x 0.6

6.40
mm

12.00
mm

5.00
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-14-U

M3.5 x 0.6

6.40
mm

14.00
mm

6.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-16-U

M3.5 x 0.6

6.40
mm

16.00
mm

6.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-18-U

M3.5 x 0.6

6.40
mm

18.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-20-U

M3.5 x 0.6

6.40
mm

20.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-22-U

M3.5 x 0.6

6.40
mm

22.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M3.5-25-U

M3.5 x 0.6

6.40
mm

25.00
mm

9.50
mm

1.00
mm

5.41
mm

5.39
mm

6.80
mm

N/A

BSO4-M4-6-U

M4 x 0.7

7.90
mm

6.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-8-U

M4 x 0.7

7.90
mm

8.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-10-U

M4 x 0.7

7.90
mm

10.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-12-U

M4 x 0.7

7.90
mm

12.00
mm

5.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-14-U

M4 x 0.7

7.90
mm

14.00
mm

6.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-16-U

M4 x 0.7

7.90
mm

16.00
mm

6.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-18-U

M4 x 0.7

7.90
mm

18.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-20-U

M4 x 0.7

7.90
mm

20.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-22-U

M4 x 0.7

7.90
mm

22.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M4-25-U

M4 x 0.7

7.90
mm

25.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-6-U

M5 x 0.8

7.90
mm

6.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-8-U

M5 x 0.8

7.90
mm

8.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-10-U

M5 x 0.8

7.90
mm

10.00
mm

4.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-12-U

M5 x 0.8

7.90
mm

12.00
mm

5.00
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-14-U

M5 x 0.8

7.90
mm

14.00
mm

6.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-16-U

M5 x 0.8

7.90
mm

16.00
mm

6.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-18-U

M5 x 0.8

7.90
mm

18.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-20-U

M5 x 0.8

7.90
mm

20.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-22-U

M5 x 0.8

7.90
mm

22.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

BSO4-M5-25-U

M5 x 0.8

7.90
mm

25.00
mm

9.50
mm

1.27
mm

7.14
mm

7.12
mm

8.00
mm

N/A

UNICORP Electronic Hardware - Self Clinching Fasteners

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UNICORP is a leader in manufacturing stock and custom
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